The president must be aware that the political costs of a land war could be “extremely high”, writes Shashank Joshi, our defence editor https://www.economist.com/united-states/2026/03/30/the-war-room-newsletter-will-trump-send-troops-into-iran?taid=69cac4b82c3aed000146e76e&utm_campaign=trueanthem&utm_medium=social&utm_source=twitter